scholarly journals Numerical model simulations of potential changes in water levels and capture of natural discharge from groundwater withdrawals in Snake Valley and adjacent areas, Utah and Nevada

2019 ◽  
Author(s):  
Melissa D. Masbruch
Keyword(s):  
Numerical Model ◽  
Water Levels ◽  
Model Simulations

scholarly journals GRAVEL BEACH PROFILE EVOLUTION IN WAVE AND TIDAL ENVIRONMENTS

2012 ◽  
Vol 1 (33) ◽  
pp. 15
Author(s):  
Mohamad Hidayat Jamal ◽  
David J. Simmonds ◽  
Vanesa Magar
Keyword(s):  
Numerical Model ◽  
Water Level ◽  
Large Scale ◽  
Water Levels ◽  
Coarse Grained ◽  
Beach Profile ◽  
Model Simulations ◽  
Parameter Values ◽  
Future Work ◽  
Gravel Beach

This paper reports progress made in modifying and applying the X-Beach code to predict and explain the observed behaviour of coarse grained beaches. In a previous study a comparison of beach profile evolution measured during large scale experiments under constant water level with numerical model simulations was made. This placed particular emphasis on the tendency for onshore transport and profile steepening during calm conditions (Jamal et al., 2010). The present paper extends that investigation to study the influence of the advection of surf processes induced by tidal water level variations effects, on gravel beach profile evolution. The parameter values and numerical model used in the simulation is similar to that presented previously. It is assumed that, to good approximation, the groundwater interface inside the beach follows the tidally modulated water level. The results obtained from the model shows that the model provides reasonable simulations of beach profile change in a tidal environment. In comparison with simulations under stationary water levels, a larger berm is produced in agreement with literature. Finally, good agreement is obtained between the model simulations and an example of field observations from a beach at Milford on Sea, UK. Further developments are outlined for future work.

scholarly journals Transient Evolution of Inland Freshwater Lenses: Comparison of Numerical and Physical Experiments

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1154
Author(s):  
Rachel Rotz ◽  
Adam Milewski ◽  
Todd C Rasmussen
Keyword(s):  
Numerical Model ◽  
Arabian Peninsula ◽  
Transport Model ◽  
Numerical Models ◽  
Water Levels ◽  
Physical Models ◽  
Laboratory Model ◽  
Arid Environments ◽  
Model Simulations ◽  
Freshwater Lenses

Brackish to saline groundwater in arid environments encourages the development and sustainability of inland freshwater lenses (IFLs). While these freshwater resources supply much-needed drinking water throughout the Arabian Peninsula and other drylands, little is understood about their sustainability. This study presents a numerical model using the SEAWAT programming code (i.e., MODFLOW and the Modular Three-Dimensional Multispecies Transport Model (MT3DMS)) to simulate IFL transient evolution. The numerical model is based on a physical laboratory model and calibrated using results from simulations conducted in a previous study of the Raudhatain IFL in northern Kuwait. Data from three previously conducted physical model simulations were evaluated against the corresponding numerical model simulations. The hydraulic conductivities in the horizontal and vertical directions were successfully optimized to minimize the objective function of the numerical model simulations. The numerical model matched observed IFL water levels at four locations through time, as well as IFL thicknesses and lengths (R2 = 0.89, 0.94, 0.85). Predicted lens degradation times corresponded to the observed lenses, which demonstrated the utility of numerical models and physical models to assess IFL geometry and position. Improved understanding of IFL dynamics provides water-resource exploration and development opportunities in drylands throughout the Arabian Peninsula and elsewhere with similar environmental settings.

scholarly journals Mechanisms of millennial-scale atmospheric CO2 change in numerical model simulations

2019 ◽  
Vol 220 ◽  
pp. 30-74 ◽  
Author(s):  
Julia Gottschalk ◽  
Gianna Battaglia ◽  
Hubertus Fischer ◽  
Thomas L. Frölicher ◽  
Samuel L. Jaccard ◽  
...  
Keyword(s):  
Numerical Model ◽  
Atmospheric Co2 ◽  
Model Simulations ◽  
Millennial Scale

Numerical model study on ice impact on Lake Superior outflow limit

2015 ◽  
Vol 42 (9) ◽  
pp. 656-664 ◽  
Author(s):  
Ian Knack ◽  
Hung Tao Shen ◽  
Fengbin Huang
Keyword(s):  
Numerical Model ◽  
Lake Michigan ◽  
Lake Superior ◽  
Flow Regulation ◽  
Water Levels ◽  
Ice Breakup ◽  
Model Study ◽  
Flow Limit ◽  
Ice Conditions ◽  
Numerical Model Study

Improved regulation of the wintertime flow from Lake Superior is needed to improve the balance of water levels of Lake Superior and Lake Michigan–Huron to decrease the frequency of extreme levels without unduly affecting Lake Superior interest. The wintertime outflow limit is set as 2410 m3/s by Lake Superior Regulation Plan 1977-A as a result of ice jam flooding during the 1916–1917 winter. This paper presents a numerical model study on the ice conditions in the St. Marys River to assess the maximum allowable Lake Superior wintertime outflow. Freeze-up, frazil transport and accumulation, and breakup were simulated with a thermal-ice dynamic model. The highest potential for flooding exists during ice breakup and simulations were run to determine a safe discharge limit for the breakup period. Simulations indicated the winter flow limit may be increased to 2690 m3/s if flow regulation is managed with care to prevent premature ice cover breakup.

Numerical model simulations of brown planthopper Nilaparvata lugens and white-backed planthopper Sogatella furcifera (Hemiptera: Delphacidae) migration

1999 ◽  
Vol 89 (6) ◽  
pp. 557-568 ◽  
Author(s):  
R. Turner ◽  
Y.-H. Song ◽  
K.-B. Uhm
Keyword(s):  
Numerical Model ◽  
Eastern China ◽  
Source Region ◽  
Brown Planthopper ◽  
Nilaparvata Lugens ◽  
Sogatella Furcifera ◽  
Model Simulations ◽  
Insect Movement ◽  
Sufficient Detail ◽  
Flight Level

AbstractThis paper reports on the performance of an atmospheric numerical model called BLAYER which has been adapted to forecast the movement of migrant brown planthopper Nilaparvata lugens (Stål) and white-backed planthopper Sogatella furcifera (Horvarth) populations from China to Korea. Comparison of model forecasts with trapping data for the 1987 and 1988 migration seasons indicated: (i) that the model is capable of successfully simulating the movement of planthoppers to Korea; (ii) that the model has sufficient detail to simulate insect movement into different regions of Korea; (iii) the source region for early season migrants is most likely to be south-eastern China (i.e. south of 25°N and east of 115°E); (iv) later season migrants may not necessarily always originate from an expanded northward region (south of 30°N); (v) the flight level of migrants may vary from about 500 to 2000 m altitude from one migration episode to another; and (vi) flight times ranging between 24 and 45 h are required to explain the migratory influxes. The results reported here have led to BLAYER forecasts of planthopper migration being produced on an operational basis within Korea.

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